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A special feature of the sarcolemma is that it invaginates into the cytoplasm of the muscle cell, forming membranous tubules radially and longitudinally within the fiber called transverse tubules (T-tubules).t each end of the muscle fiber, the surface layer of the sarcolemma fuses with a tendon fiber, and the tendon fibers in turn collect into bundles to form the muscle tendons that then adhere onto bones.
Each muscle fiber contains following structures: 1  Sarcolemma: Plasma membrane of a muscle fiber that forms T tubules. 2  Sarcoplasm: Cytoplasm of a muscle fiber that contains organelles, including mitochondria. 3  Glycogen: A polysaccharide present in sarcoplasm that stores energy for muscle contraction.